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As of December 2016, five satellite collisions have resulted in generating space waste.Collisions with debris have become a hazard to spacecraft; they cause damage akin to sandblasting, especially to solar panels and optics like telescopes or star trackers that cannot be covered with a ballistic Whipple shield (unless it is transparent).
It includes the fragments from their disintegration, erosion and collisions.
The 13-month centered average is meant to give an indication of the lower frequency variations in the data; the choice of 13 months is somewhat arbitrary… The linear temperature trend of the global average lower tropospheric temperature anomalies from January 1979 through January 2018 remains at 0.13 C/decade.
The Version 6.0 global average lower tropospheric temperature (LT) anomaly for January, 2018 was 0.26 deg. C: Global area-averaged lower tropospheric temperature anomalies (departures from 30-year calendar monthly means, 1981-2010).
Manned missions are mostly at 400 km (250 mi) and below, where air drag helps clear zones of fragments.
Atmospheric expansion as a result of space weather raises the critical altitude by increasing drag; in the 90s, it was a factor in reduced debris density.
Close approaches (within 50 meters) are estimated at one per year.